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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| Accès en ligne: | https://arxiv.org/abs/2511.02184 |
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| _version_ | 1866913063599341568 |
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| author | Ghosh, Avirup Sopov, Alexei H. Volkas, Raymond R. |
| author_facet | Ghosh, Avirup Sopov, Alexei H. Volkas, Raymond R. |
| contents | We consider the Standard Model (SM) extended by a secluded $U(1)_D$ gauge sector encompassing a Dirac fermion ($χ$) dark matter (DM), an abelian gauge boson $Z^\prime$ and a SM-singlet complex-scalar field $Φ$, whose radial component drives cosmic inflation. When the Higgs portal coupling is small, the $Z^\prime$ then acts as a {\it ``reheaton''}, dominating the energy budget of the Universe before finally yielding the SM bath, with reheating temperature $< O(10)$ TeV, through the gauge portal interaction. We explore the possibility that DM freezes-in via non-thermal $Z^\prime$ decays before reheating ends, giving rise to substantial viable parameter space. We account for non-perturbative effects, relevant during the initial stages of reheating, using lattice simulations. We additionally show how the cosmological gravitational wave (GW) background produced by preheating and inflation allow for a direct probe of the reheating mechanism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_02184 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dark Matter Freeze-in from a $Z^\prime$ Reheaton Ghosh, Avirup Sopov, Alexei H. Volkas, Raymond R. High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We consider the Standard Model (SM) extended by a secluded $U(1)_D$ gauge sector encompassing a Dirac fermion ($χ$) dark matter (DM), an abelian gauge boson $Z^\prime$ and a SM-singlet complex-scalar field $Φ$, whose radial component drives cosmic inflation. When the Higgs portal coupling is small, the $Z^\prime$ then acts as a {\it ``reheaton''}, dominating the energy budget of the Universe before finally yielding the SM bath, with reheating temperature $< O(10)$ TeV, through the gauge portal interaction. We explore the possibility that DM freezes-in via non-thermal $Z^\prime$ decays before reheating ends, giving rise to substantial viable parameter space. We account for non-perturbative effects, relevant during the initial stages of reheating, using lattice simulations. We additionally show how the cosmological gravitational wave (GW) background produced by preheating and inflation allow for a direct probe of the reheating mechanism. |
| title | Dark Matter Freeze-in from a $Z^\prime$ Reheaton |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2511.02184 |